Load characteristics of a vehicle diesel engine using natural gas as a fuel

Abstract

The article presents the load characteristics of the D-245.7 diesel engine when working on the gas-diesel process. The graphs of changes in the indicators of the combustion process, heat release characteristics, effective indicators are given. The problem of increasing the cost of gasoline and diesel fuel, the limited natural reserves of oil push to the need to find alternative fuels for automobile transport. Among the entire list of promising fuels, natural gas has many advantages. The most important advantage is low cost. It is important to study the issues of converting diesel engines to natural gas, as diesel engine is the most common in the national economy. The most suitable way to convert diesels to natural gas is to implement a gas-diesel working process, since it does not require a significant alteration of the engine. The diesel engine D-245.7 was selected as the object of study. During the study, among other things, the load characteristics of this diesel engine were taken while working on the gas-diesel process. When analyzing the experimental data obtained in the gas-diesel process compared to the diesel one, some features were noted. At the gas-diesel process, an increase in temperature and gas pressure in the cylinder is observed. Heat dissipation happens much faster. This indicates the volumetric nature of the ignition and combustion of natural gas. Engine power during the transition to the gas-diesel process is maintained at the same level, while the consumption of diesel fuel due to the substitution of natural gas is reduced by several times.